/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.webapi.view;

import java.io.IOException;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.stream.StreamSource;
import org.springframework.core.io.ClassPathResource;

/**
 * @author Morten Olav Hansen <mortenoh@gmail.com>
 */
public class ClassPathUriResolver implements URIResolver {
  private String templatePath = "/templates/";

  public ClassPathUriResolver() {}

  public ClassPathUriResolver(String templatePath) {
    this.templatePath = templatePath;
  }

  public String getTemplatePath() {
    return templatePath;
  }

  public void setTemplatePath(String templatePath) {
    this.templatePath = templatePath;
  }

  @Override
  public Source resolve(String href, String base) throws TransformerException {
    String url = getTemplatePath() + href;
    ClassPathResource classPathResource = new ClassPathResource(url);

    if (!classPathResource.exists()) {
      throw new TransformerException("Resource does not exist in classpath: " + url);
    }

    Source source = null;

    try {
      source = new StreamSource(classPathResource.getInputStream());
    } catch (IOException e) {
      throw new TransformerException("IOException while reading URL: " + url);
    }

    return source;
  }
}
